Improvement in bolts for locks



PATENT @Enron THEODORE KROMER, OF NEUSTADT, GRAND DUCHY OF BADEN.

IMPROVEMENT IN BOLTS FOR LOCKS.

Specification forming part of Letters Patent No. 119,036, datedSeptember 19, 1871.

To all whom it may concern: V

Beit krwiown that I, TrrEoDoRE Knot/EER, of Neustadt, in the Grand Duchyof Baden, have invented an Improved Construction of Locks and `Latches;and do )hereby declare that the followin-g description, taken inconnection with the accompanying drawing, hereinafter referred to, formsa full and exact specification of the same, wherein I have set forth thenature and principles of my said improvement, by which my invention maybe distinguished from others of a similar class, together withV suchparts as I claim and desire to secure by Letters Patentthat is to say:

My invention relates to door-locks; and the nature thereof consists incertain improvements and modifications in the details of theconstruction of the same, as hereinafter shown and described.

The arrangement which it is preferred to employ is shown in theaccompanying drawing, in which Figure l shows a front view of the lock.Fig. 2 shows a side view, partly in section. Fig. 3 shows a section online X X, Fig. 1. Fig. 4 shows a plan, and Fig. 5 shows the keyto thelock.V Figs. 6, 7, 8, and 9 illustrate the construction andv arrangementof the sliding bolt.

The lock consists of the rectangular `(or otherwise shaped) casing P,with a cylindrical projection, P', in which are formed live or any otherdesired number of cylindrical recesses, l 2 3 4 5, arranged in a linewith each other. At the front end these recesses are reduced in size, asshown, while at the back end they are closed by a plate, S, secured byscrews s s to the casing I. In the recesses are iitted sliding pins GlG2 C3 G4 C5, inserted from the back end, and having each a series ofannular grooves, as shown, one groove of each being of greater depththan the others, which deep grooves are situated at different distancesfrom the ends of the pins. Behind the pins are inserted spiral springs FF, which, when the pins are not acted upon by the key, press the., pinsoutward against the front ends of the recesses, where they are retainedby the shoulders formed by the reduced apertures. The key L, Fig. 5, hasa row of pins corresponding in number and position to that of theapertures in the lock, while the length of each. pin corresponds withthe distance ofthe deep groove from the inner or back end of therespective sliding 'pin upon which it acts, so that by the introductionof the key into the lock the sliding pins are all depressed in theirrecesses in such a manner that all the deep grooves are brought in aline, as shown in Fig. 3. When in this position the bolt or latch G,turning upon a pin, Z, and fitting into a longitudinal groove in thecasing, can fall with its thin lower edge h i into the before-mentioneddeep kgrooves or notches, so as to assume the position shown in fulllines in Fig. l, in which position thelock or latch is open. If thelatch G be raised by any suitable means slightly out of the deep groovesof the pins C, (the key having been removed,) these are pushed forwardby the springs F, whereupon the catch cannot fall beyond the dottedposition G1, in which case it is locked, at the same time catching intothe shallow notches of the pins C. If it be desired to unlock the latchagain, it must iirst be raised still higher-say into the position G-soas to be clear of the shallow notches of the pins, after which the keyis introduced as before, and the latch allowed to fall in the lowestposition.

The picking of this lock may be effectually prefore-described lock,(viewed from the opposite side to that shown in Fig. 1,) and A is thesliding bolt, both of which are supposed to be fixed against a door tobe fastened by the sliding forward of the bolt A. This bolt is soarranged that its outer face can just slide behind the inner face of thelatch G, as indicated. It is provided with a triangular projection orstud, B, projccting somewhat over the latch. When the bolt is shotforward and the lock is locked, as shown mostdistinctly in Fig. 8, andit is endeavored to push the bolt back, the stud B strikes against thesurface a b of the notch in the latch and raises the latter slightlyuntil the stud arrives at the bottom of the notch, when any furtherbackward motion ofthe bolt is impossible. When it is desired to unlockthe lock and withdraw the bolt, this is slid `back as just described,thereby rais- -ing the latch sufficiently to clear all the notches ofthesliding pins C, Fig. 3, whereupon these pins are moved by the action ofthe key so as to bring the deep grooves in a line with the latch, asbefore described. rlhe bolt A is now again slid forward so as to allowthe latch G to fall into its lowest or unlocked position, as shown indotted lines at Fig. 6, (corresponding with the position G at Fig. 1,)whereupon the bolt A, with its stud, will be free to slide back alongthe upper edge of the latch until the bolt arrives in the dottedposition, Fig. 6. Here the stud B comes in contact with the projectinginclined surface d o of the latch, so that by sliding the bolt stillfurther back it raises the latch by causing the inclined surface d c 7Lthereof to slide along the stud, as indicated in Fig. 7 the latch beinggrooved, as shown more clearly in Fig. 4, to allow this motion. By thusraising' the latch the pins C are again free to be moved forward out ofthe unlocked position bythe springs F, so that when the bolt is againshot forward for locking the door (during which motion the stud B slidesunderneath the latch, as shown in Fig. 9) the latch will again fall intothe locked position at Fig. S.

Having thus described the construction, operation, and relativearrangement of the component parts of a lock or latch embodying myinvention, I will indicate in the following clauses what I claim anddesire to secure by Letters Patentthat is t0 say:

I claiinl. The boltA provided with the stud B, in combination with thelatch G provided with the notches a Z1 and el c 7L, when operatingtogether, as described.

2. The arran gement and combination of casing I), row of notched slidingpins C, springs F,latch G provided with notches a b and c d 7L, and boltA provided with the stud B, operating together, as described.

In testimony whereof I have signed my name to this speciiication in thepresence of two subscribing witnesses this 28th day of December,

THEODORE KROMER. Witnesses:

SIMON MAYER, BLAsIUs BRUGGER.

